Face forgery videos have caused severe social public concern, and various
detectors have been proposed recently. However, most of them are trained in a
supervised manner with limited generalization when detecting videos from
different forgery methods or real source videos. To tackle this issue, we
explore to take full advantage of the difference between real and forgery
videos by only exploring the common representation of real face videos. In this
paper, a Self-supervised Transformer cooperating with Contrastive and
Reconstruction learning (CoReST) is proposed, which is first pre-trained only
on real face videos in a self-supervised manner, and then fine-tuned a linear
head on specific face forgery video datasets. Two specific auxiliary tasks
incorporated contrastive and reconstruction learning are designed to enhance
the representation learning. Furthermore, a Domain Adaptive Reconstruction
(DAR) module is introduced to bridge the gap between different forgery domains
by reconstructing on unlabeled target videos when fine-tuning. Extensive
experiments on public datasets demonstrate that our proposed method performs
even better than the state-of-the-art supervised competitors with impressive
generalization.

通过自我监督学习的实现，该论文提出了一种自我监督变压器协同对比和重建学习 (CoReST) 方法，该方法首先仅在真实人脸视频上进行自我监督预训练，然后在特定的人脸伪造视频数据集上用线性头进行微调，通过引入对比和重建学习的辅助任务来增强表示学习，同时引入领域适应性重建模块来弥合不同伪造领域之间的差距，实验结果表明，该方法在公共数据集上的表现比现有的有监督竞争方法更好，并具有令人印象深刻的泛化性能。